Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 05 Jan 2015

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

10(6)

21(21)

27(-)

19(8)

0.4(4)

8(34)

South

6(4)

19(19)

28(-)

45(19)

0.4(4)

11(46)

East

8(5)

18(18)

21(-)

40(17)

0.4(4)

11(48)

West

3(2)

19(19)

11(-)

46(20)

0.4(4)

11(45)

Central

5(3)

18(18)

23(-)

55(23)

0.5(5)

8(35)

1-hr PM2.5 (µg/m3)b Readings on 05 Jan 2015

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

5

5

3

3

5

6

7

8

7

8

14

12

South

2

1

2

2

4

4

6

8

10

16

17

19

East

5

8

7

4

5

5

9

13

11

10

13

16

West

2

4

2

4

3

8

10

10

9

13

13

21

Central

4

3

5

3

3

5

7

7

9

6

7

14

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

6

12

9

11

11

4

11

10

11

16

10

-

South

17

16

16

17

17

14

11

9

15

9

15

-

East

19

15

11

12

20

14

18

8

6

11

14

-

West

16

12

15

24

14

16

11

8

14

6

9

-

Central

11

6

13

9

6

10

14

12

7

10

11

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
05 Jan 2015

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

24

18

16

16

15

18

24

31

37

41

46

51

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

54

53

52

52

53

52

52

47

46

42

46

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.